Steam-engine.



No,V 790,358. PATENTED MAYZB, 1905. H. F. FRISBIE.

STEAM ENGINE. APPLIOATION FILED snm'. ze, 1904.

No. 790,358. PATBNTED' MAY 23, 1905.

' H. P. PRISME.

STEAM ENGINE.

PPLIOATION FILED SEPT. 2e, 1904. v

4 SHEETS-snuff 2.

MT1/75.5555 y ffl Vex- [ad PATBNTBD MAY 23, 19o5.

H. P. FRISBIB. vSTEAM ENGINE. A PILlUATION FILED SEPT.v 26, 1904.

Patented I'Iay 23', 190.5.

,PATENT OFFICE..

I-IAMLIN F. FRISBIE, OF CINCINNATI, OHIO.

STEAM-ENGINE.

' 'SPECIFICATION forming part of Letters Patent N0. 790,358, dated May 23, 1905.

Application tiled September 26, 1904. Serial No. 225,965.

To all whom t 11a/ty concern.-

Be it known that I, HAMLIN F. FRisBIE,a citizen of the United States, residing in the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Steam-Engines; and I do declare the following to be a clear, full, and exact description thereof, attention being called to the accompanying four sheets of drawings, with lthe reference characters marked thereon, which form also a part of this speciiication.

This invention relates to improvements in` the construction of steam-engines of a type usually employed for marine purposes as applied :to river Steamers, and comprises accordingly features which are specific t that type.

It also comprises features which may be used on most any typev of steam-engine in general irrespective of its particular use and purpose.

It further comprises cut-ofi' mechanism whereby the effective duration of the stroke may be controlled and which control may be a positive one' in form of regulation by man'- ual adjustment, or it may be an automatic control by a governor, in which latter case the engine becomes a so-called automatic one.

The invention consists of the general and specific construction of these various features alluded to and as they, together with their operation in each case, are hereinafter described and claimed and also illustrated in thel accompanying drawings, in which- Figure l shows the cylinder of my improved steam-engine in side elevation, parts of its supporting-frame toward the observer being omitted. Fig. 2 is a longitudinal sectionV thereof with the piston in intermediate position between the ends of the cylinder. Fig. 3 is a top view of. it. Fig. 4 is a vertical cross-section through the cylinder and its valves near one end. Fig. 5 is a similar section between the ends'and near the center of the cylinder. Fig. 6 shows, at reduced scale, a top View of the engine with certain auxiliary parts. Fig. 7 is a side elevationof the preceding figure. Fig. 8 is an end elevation (the left one) of Fig. 7 Fig. 9 is an enlarged detail View of the cut-off mechanism'as it appears when viewed from one of the ends of the cylinder, parts being showny in section and others are broken away. Fig. 10 shows a front view of this mechanism. Fig. 11 isa top view of it, the position of the operative parts shown being the one in dotted lines in Fig. 10. Fig. 12 in a similar view shows these parts in position shown in full lines in Fig. 10, parts back of it appearing in horizontal section taken on line 12 12 of Fig. 9. Fig. 13 is a horizontal section on line 13 13 of Figs. 9 and 10. Fig. 14 is a sectional detail view showing construction of pivotal support for the upper tumblers.

The engine provided with certain auxiliary parts, as shown more particularly in Figs. 6, 7, and 8 on Sheet 3, is adapted for steamboat use, such parts being not required when the engine is used asa stationary one.

is the steam-cylinder, provided on its side with laterally-projecting supporting-lugs 21, fitted into shoes 22, which rest on the upper edges of the engine-frames 23,called also engine-timbers in steamboat construction. In Fig. 1 the frame part nearest the observer is omitted to show parts back of it.

24 is the piston; 25, the piston-rod, connected to the cross-head 26, which latter is fitted to move on slides 27, whereby it is guided, and

which slides are also supported on the engineframe. connects also to this cross-head and by means of a crank on the main shaft, (not shown,) to which it connects, converts the linear reciprocatory motion of the piston into a rotary one and transmits it at the same time to the main shaft in the customary manner.

The Valves used here are shown as puppetvalves,v this type being particularly suited, but not absolutely required, for marine purposes, and as to certain other parts of the engine the invention is not limited to this particular style of valve.

There is an .admission or steam valve 29 and an exhaust-valve 31 at each end of the cylinder, all substantially of cylindrical form and contained in valve-chambers of corresponding shape. These valve-chambers pro- The connecting-rod or pitman 28 ject from the side of the cylinder near the ends thereof at points diametrically apart and one vertically below the other.

32 represents the chambers for the steamvalves, and 33 represents the chambers for the exhaust-valves, and, as shown, the former are on the upper and the latter on the under side of the cylinder. These chambers at their inner ends4that is, toward the cylinder-are in open communication with this latter by ports, 34 being the inlet-ports and 35 the eX- haust-ports, all controlled by the valves above mentioned, and the seats for which latter are formed around these ports. The valve-chambers on a side are also in open communication with each other by means of side pipes, one, 36, connecting the upper valve-chambers 32 and another side pipe, 37, connecting valvechambers 33, so that one steam-pipe is capable of supplying the two steam-chests, and one exhaust-pipe will accommodate the two chambers of the exhaust-valves. rlhese side pipes are arranged close to the cylinder, thus bringing also the valve-chambers closer thereto and avoiding all dead waste-spaces, which would increase the condensation of steam.

38 is the nipple for connecting the steampipe, and 39 is the nipple for connection of the exhaust-pipe. For convenience in manufacture each valve-chest is provided with a cage 41, into which the respective valves are fitted for their sliding movement to and from their seats formed around the particular ports which they control. Sliding contact is only for a part of the engaged surfaces to limit friction, and at the outer ends of the valves this contact is by a head 42, provided on each valve, which head has also packing-rings in its side to provide for steam-tight fit. Small ducts are provided in these heads to drain the space inelosed by them.

Caps 43 close all valve-chambers, with exception of au opening through which valve-stems pass in each case, 44 being the stems for the steam-valves and 45 those for the exhaust-valves. Customary stufiing-boxes are provided in these caps where the stems pass through them. The movement of the valves is a sliding one to and from their seats, and they are accordingly operated. For opening their operation is a positive one, they being lifted for such purpose, while for closing they may simply drop, which movement may be accelerated by the action of springs. The action on the valve-stems is therefore accordingly, they being reciprocated in a vertical direction by so-called tumblers, which are simply oscillating angle-levers, one member of each of which acts upon the particular valve-stern, while the other member is connected for actuation. For the steam-valves the two branches or arms of each angle-lever are in one piece, the lower ones, arms 46, being' the ones which effect lifting of the valves, while the upper branches, 47, receive posithe th e caps 50.

tive actuation by means of links 48, whereby they are connected for simultaneous operation. These angle-levers are supported ou bosses 49, projecting from the side ol the cylinder-casting, and to which bosses their pivots are attached, being held in sockets by rlhe means whereby these lower arms 46 act upon the steam-valves are lifterrods 51, coupled each by a knuckle-joint 59. to the outer end of lifting-levers 53, connected to valve-stems 44 by means of links 54. Levers 53 are pivotally supported on posts 55. Springs 56 on each stem 44 may accelerate the seating of these valves. Then no cut-off action is desired, or, in other words, when steam is to be admitted during the entire length of the stroke, these arms 4G ol the angle-levers act directly against the lower ends of lifter-rods 51 in a manner to raise the admission-valves to full extent and holding them so to the end of the stroke. Then a cut-off action is desired, intermediatedevices are interposed, which terminate this action and close the admission-valves before the termination of a stroke at certain positively or automatically determined points. ',lhese devices will be more specifically described later on.

The angle-levers or tumblers for the cxhaust-valves are in two parts each rigidly mounted upon a rock-shaft 57, supported in bearings 58. rlhe lower of these two parts or arms 59 engage stems 45 of the exhaustvalves by means of a yoke 6l on each stem, into which yoke the ends of these arms 59 extend. The lower ends of these valve-stems below such yokes move in guideyokes (32, whereby these stems are held toa straight movement. The other members or parts of these angle-levers are constituted by arms 63, also rigidly'mountcd on rock-shafts 57. '.lhe free ends of these arms are connected for simultaneous operation by means .of links 64. Midway their ends these links, as well as thcl upper links 48, are jointed by coupling-pieces, one, 65, for the upper links and another, (Sli, for the lower ones. These coupling-joints are attached in a manner to receive action from a rock-shaft whereby they, with the counected links, are reciprocated in opposite directions, oscillating also all the tuinblers or anglelevers and operating all the valves. rl`he operation is a simultaneous one, as may. be best seen in Figs. l and Q, one steam-valve at one end and one exhaust at the other end being always open,while the others are closed. In detail this rock-shaft connection is as follows: The lower coupling-joint G6 is attached to an arm or equivalent disk (57 and the upper one to an arm 68, both mounted on a rock-shaft 69, (the rock-shaft previously had in mind,) so that all swing together. For purposes of its support this rock-shaft is in form of a sleeve and mounted upon a stud or spindle 7l, projecting from the side of the steamlOO Ifo

cylinder and set with its inner end into asocket 72 on the outside of this latter. .It is held in position by a cast structure forming on its inner end a collar 73, fitted against a shoulder 74 on said spindle and against the side of the cylinder, to which it is bolted by means of ianges 75, projecting laterally from the collar. Two arms 76 project also outwardly from this latter, which form between them on their outer ends a bearing 77, in which the outer end of rock-shaft 69 is supported. This entire support and attachment is further strengthened by braces 78, passing from the outer end of this supporting structure back to the cylindercasting, to which they are bolted. This rockshaft 69 is actuated by means of a rod 7 9, attached to disk 67 and operated by means of an eccentric or, preferably, acam (not shown) in the usual manner from the main engineshaft, and which shaft is rotated by means of a crank and the connecting-rod or walkingbeam 28, attached to cross-head 26, before described.

The invention being shown as applied to a steamboat-engine, the attachment of rod 79, which actuates rock-shaft 69, is an adjustable one to permit reversal of the engine. For such purpose there are at the end of this rod two hooks 81, adapted to engage either one of two pins 82 on disk 67, diametrically apart thereon and equidistant from the center, and whereby when the engagement is changed from one pinto the other the order of admission of steam to the'valves is changed in a manner to reverse the engine and change the direction of travel of the boat. In order to permit this reversing motion to be quickly performed and to make rapid change from one position to another possible, the parts which form hooks 81 are extended toY form closed harp-shaped yokes 83, and the space between pins 82 is closed by a bar 84, con-4 nected to their ends and passing over the outside of theyokes'. The position of the hooked end of rod 79 may now be quickly changed by raising or lowering this end to engage either one of pins 82 or to be held in an intermediate position (see dotted lines in Fig. 7) without any possible disengagement or loss of time in trying to find the new position. It is for this reason also that I use a disk as furnishing more of `a surface against which yokes l83 may slide while being adjusted and which disk might otherwisebeV merely an arm. For so raising or lowering rod 79 a reversing-lever 85 is provided, connected by a link 86 to an angle-lever 87, which .latter by a shifterrod 88 lifts or lowers rod 79. Ay counterweight 89 assists this manipulation.l On account of this reversing manipulation,-which requires a raising or -lowering of rod 79, it is necessary that this latter be provided with a joint, as shown at 91, and owing to the distance in a steamboat between the c ylinder and the wheel -shaft, which is -thc main: engineshaft, it is desirable to have an intermediate support, which is shown in shape of a bracket 92, projecting from the side of the engineframe. These parts relating to this reversing manipulation of the engine are illustrated on Sheet 3; but in the mainthis method of so reversing is not considered new. In case the engine is usedfor stationary purposes all these particular parts are of course not required, and the end of rod 79 would be permanently connected to vdisk 67 or to an equivalent arm which would project from rockshaft 69. Means are provided for attachment of a Ahand-lever (see dotted lines at 93 in F ig. 5) to actuate the disk by hand whenever necessary to move the valves and the entire mechanism connected with them. A socket 94 is provided at the upper edge of disk 67 for the purpose of attaching this handlever.

Means for adjusting positions of parts and extent of motions are provided in shape of right and left threaded adjusting-nuts 95 on links 48 and 64 andla sliding attachment 96 for links 64 to arms 63 of the lower tumblers.

Coupling-joint 65 for the upper links 48 is y also connected so as to be adjustable on arm 68, and coupling-joint 66 may also be adjusted on disk 67.

As has been stated before, when no cut-off action is desired-that is, when steam is to be admitted during the entire duration of a fulllength piston-stroke*theaction of lower arms 46 of the upper tumblers against the lower end of lifter-rods 51 is a direct one, and they would correspondingly hold the steam-valves open to the end of the stroke.

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Where a cut-off action is desired, intermediate devices are interposed, whereby this action as transmitted by the tumbler-arms may be interrupted at any point'of the stroke before the end of the same is reached, so that the steam-valves may be permitted to close correspondingly sooner. The determination .of this point maybe arranged for positively by previous manual adjustment, so that interruption of this action on the steam-valves, or, in plain words, cut-off of admission ofv steam, may take place at such point thus previously determined, or the determination of i this point may be left to the automatic -con'- trol of a governor, which would act in accordance with conditions of the work performed by the yengine at the time. The first formpositive'control by previous manual adjustment-#is preferable for steamboat work, while the automatic control may be resorted to when the engine is a stationary one. "For these' purposes lower arms 46 of the upper tumblers instead of acting'directly against the 'lower end of lifter-rods 51 act against anv intermediate lifting-slide 97, fitted for a sliding Inovement into a bracket 98, of'which there is one bolted to the outside of each steam-chamber 32. Eaclrlifting-slide carries? on its-front side two catch-dogs 99, pivotally attached so as to have a lever action and subject to spring action, whereby they have a tendency at their lower ends to approach each other. This action is imparted by springs arranged in any suitable way or as shown, 101 being the springs. They are attached so as to move with the slide, being supported on it or on a bar 102, attached to the slide, and which bar may serve also as a means to hold the lower part of lifter-rods 51 in position and guiding it during its movement. The lower end of each lifter-rod has two lateral projections 103, the extreme ends of which are normally engaged by dogs 99, as best shown in Fig. 1, valve at left end of cylinder, also in Fig. 10, the engagement .being due to the action of springs 101. The rear part ot' each slide 97 projects outside of bracket 98 and is arranged to be above part 46 of its tumbler and in the path of the same, so that when this tumbler oscillates it will act upon this slide and lift the same. This latter will also raise lifter-rod 51, the lower end of which isengaged by the dogs carried on the slide, and thus open the steamvalves, the stems 44 of which connectto these lifter-rods by links 54. Unless interrupted it is obvious that this engagement or' the lifterrods by dogs99 continues, and which engagement causes the two to move together and become subject as a unit to the action of tumbler-arms 46, by which the steam-valves are opened and closed, interrupting it before the normal valve-operating mechanism (tumblerarms 46, rock-shaft 69, disk 67, and rod 79) closes the valves, cuts the steam off before the end of the piston-stroke, and thereby provides the desired cut-ofi'. This interruption is produced by two trippers 104, supported so as to be in the path of the upper ends of dogs 99 when arms 46 raise them by means of slides 97, on which they are carried. The action of these trippers is to push the upper ends of the dogs inwardly-that is, toward each other causing their lower ends to spread-that is, move apart-thus permitting the lifter-rods to slip through between them and drop, as best shown in Fig. 1, valve at right end. It

is also shown in Fig. 10, (position in dotted' lines,) dogs 99 having just come in contact with the trippers and will presently be moved to drop the lifter-rod. The support of these trippers is furthermore so as to render them adjustable (it being pivotal in this case) on the face of brackets 98, permitting changes which may cause the upper ends of dogs 99 to encounter them sooner or later, dropping, accordingly, the lifter-rods, and with them the valves, sooner or later and providing for a variable cut-otf. Finally and at the end ot' the completed stroke and subject to the normal operation ofthe general valve-operati ng mechanism and arms 46 slides 97 will also be permitted to drop and following the lifter-rods assume theirnormal position. (See left valve,

Fig. 1, and position in iull lilies in Fig. 10.) 1n so assuming their normal position dogs 99 on the slides also rengage projections 10? on the end of lifter-rods 51, so as to be in readiness for the next lift. This rengagement is facilitated by the shape of the contacting surfaces, they being inclined, as best shown in the drawings, so as to permit the dogs while yielding laterally to slip over the ends olE projections 103, after which they close in again when below them, due to action ol springs 101. Stops 105 limit this action of the springs and prevent them to return dogs 99 beyond their proper position at times when they are not held apart by the lower end of the lifterrods between them. 'lfhedrop ot' slides 97 may be eased by a butl'er 106.

For adjusting the trippers with reference to the dogs to drop the lifter-rods at a certain point of the piston-stroke the set for a valve are connected so that they may be moved simultaneously toward each other or apart. This is done by means of links 107, attaching them at points diametrically apart to a disk 108, mounted on a pivot 109 and supported in a bridge 111, attached to brackets 9S. A lever-handle 112 on each pivot serves for manipulation, and a dial or quadrant 113, with a graduated scale, serves to indicate the position to which to set these handles in order to cut 01T at a certain point. lt is preferable to connect these lever-handles 112 ior simultaneous adjustment, so that they may be set by one manipulation. This may be done by simply connecting them by a rod 114, (see dotted lines in Figs. 1 and 7,) or two links 115, passing to a double-angle lever 116, may be used. This angle-lever would be supported in a stationary position and adjustnwnt'. would be by moving it by lneans oi a rod 117 on it. Any means may be used for moving this rod and for holding` it, together with levers 112 and trippers 104, in adjusted position. It may be a hand-lever n'ioving along a notched quadrant, or a nut 118, (see Fig. 7,) held to a bracket 119, may be used. '.lfhese would be positive methods ot controlling the cut-oli', the regulation being by manual adjustment. By omitting nut 118 and leaving rod 117 free thcreat, but connecting it to a governor 120, (see Fig. 7,) the adjustment would become automatic, subject to the action of the governor as inliuenced by the work ol" the engine. This would be a suitable method when the engine is used for stationary purposes. Either one of these methods ole adjusting the trippers 104 would be suitable in connection with a construction where an eccentric is used on the main engine-shaft (not shown) to reciprocate rod 79, which actnates the valve-operating mechanism.

The above-described methods of positively adjusting trippers 104 would not be suitable in steamboat-engines using puppet-valves and where it is desirable to have these valves ginning of the stroke.

`stroke.

shaft instead of by an eccentric, as above mentioned. This would be so because the trippersE being held in a certain position after adjustment, Whether manual or by the governor, will trip the dogs while being lifted, at the point of cut-off to which said trippers' have been set, as soon as they come in contact with them and irrespective of whether the valves have been lifted and opened to their full capacity or not. As a result, a corresponding limited quantity of steam is admitted only at the be- To obviate this premature trip, I arrange parts .so that the trippers are out of the way ofthe dogs at the moment when they are abruptly lifted by the tumblers, so that they may be raised to their Ifull height and may lift the valves at once to their full opening, at the beginning of the I arrange it, further, that at the moment when the piston arrives at the point VWhere it is desired to cut off the steam said trippers act upon the dogs the same as before and by tripping them drop also the valves.

-Finally, the parts are again adjustable so that the moment of action of the cut-off is again adjustable with reference to the position of the piston, the same as before described, for the positive control. For such purpose trippers 1011 are given a reciprocatory oscillating motion to and from each other, and the motion is so timed that they are apart at the time when the dogs are lifted or are moving apart sufiiciently ahead, so as to keep clear of them, the position being about as shown for left valve in Fig. 1 or position in dotted lines in Fig. 10. They move in the opposite direction and close in against the dogs so as to trip them at the proper time, which is, however,

lnever before dogs and valves have attained their highest position. This movement ofthe trippers is obtained by rocking disks 108 on pivots 109 by means of lever-handles 112, the latter being moved-that is, swung-at their free ends by reciprocating links 115 and anglelever 116. For such purpose this latter is pivoted to a post 121, projecting from a slide-rod '122, supported for movement in brackets 98.

It is to be noted that for so swinging leverarms 112 links 115 and angle-lever 116 are of no significance, since they are immovably held in their adjusted position with reference 4to post 121 and slide-rod 122. The movement of this latter must be corresponding to or be proportional to the movement of the pistonstroke, so that the movement of the trippers assumes a similar relation, since these latter are expected to act at certain times with reference to the piston and when the same has arrived at certain points. A suitable method of obtaining this movement is by connection to cross-head 26, since the movement of this latter is coextensive with the movement of the piston. It is not necessary, however, that this movement be of similar extent, which would require large machine parts and levers, and to obviate this it is preferable to reduce this movement, the same effect being obtained Aas long as this reduced movement of slide-rod 122 is proportioned to the movement of the cross-head, so that if any particular action `(cut-off) takes place at any particular point of the reduced movement this same point will be located relatively in a similar position of the piston-stroke. To obtain this movement, I attach a pendulum-rod 123 to cross-head 26, the upper part of which is free to slide and swing in a box 124 in conformity to the movement of its lower end as imparted by the cross- `head. Box 124C, swings on a spindle 125, supported between frames 126. Another pendulum-rod 127 connects with its lower end pivotally to one of these latter and with its upper end to a box 128, fitted solas to be free to slide on rod 123. A connecting-rod 129 connects slide-rod 122 to rod 127, thus rendering this rod 122subject to a reduced but proportional movement derived from the cross-head and piston. As before stated, in the further transmission of this movement links 115 and angle-lever 116 are of no signiiicance, and for the purpose of the mere movement lever-handles 112 might be directly connected to sliderod 122. They permit, however, an adjust- Vment of the motion of trippers 104;, so that vthey act upondogs 99 by closing in on them at certain times equivalent to certain positions of the. pistons, so that the valves may be dropped and the steam cut oif sooner or later after the dogs have been lifted to their highest position. rIhis adjustment is the positive one by direct manual manipulation before described and is by action on angle-lever 116 and rod 117, as stated, or by equivalent means. The valve-operating mechanism describedas actuated from the main shaft by rod 79 may also be actuated by other equivalent meansas, for instance, by gearing.

Having described my invention, I claim as new` 1. In a steam-engine, the combination of a cylinder, two valves provided at each end of the same, tumbler-levers, one for each valve to operate them, links connecting the tumblerlevers of two valves on a side, a hollow rockshaft, engine-driven means to oscillate the same, intermediate means whereby the links are connected to this rock-shaft in amanner to reciprocate simultaneously in opposite directions, a spindle on which this rock-shaft is mounted, a socket on the side of the cylinder occupied by the inner end` of this spindle, a shoulder on this"l latter, a collar tted against this shoulder and bolted to the side of the cyl- IOO inder, arms projecting from this collar, a bearing formed between their outer ends supporting the outer end of the rock-shaft and braces on each side of this bearing connecting the same with the cylinder-casting.

2. In a steam-engine, the combination of a cylinder, a steam-admitting valve at each end, a stern on each valve, a lifting-lever supported at one of its ends and to which this valve-stem is connected between the ends thereof, a lifterrod connected to the other end of this liftinglever, a lifting-slide to raise this rod, engineoperated means to raise this slide and intermediate means detachably connecting this slide to the lifter-rod to render the latter independent from the engine-driven means.

3. In a steam-engine, the combination of a cylinder, a steam-admitting valve at each end, a stem on each valve, a lifting-lever supported at one of its ends and to which this valve-stein is connected between the ends thereof, a lifterrod connected to the other end of this liftinglever, a lifting-slide provided with spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together and adjustably-supported trippers adapted to operatein a manner to disengage the dogs from the lifter-rod, permitting the same to drop and the valves to close independent of the engine-operated parts.

4. In a steam-engine, the combination of a cylinder, a steam-admitting valve at each end, a stem on each valve, a lifting-lever supported at one of its ends and to which this valve-stem is connected between the ends thereof, a lifterrod connected to the other end of this liftinglever, a lifting-slide provided with spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, adjustably-supported trippers adapted to operate in a manner to disengage the dogs from the lifter-rod, permitting the same to drop and the valves to close independently of the engine-operated parts and a rod connectingthe trippers of one valve set, with that of the other to permit simultaneous adjustment.

5. In a steam-engine, the combination of a cylinder, a steam-admitting valve at each end, a stem on each valve, a lifting-lever supported at one of its ends and to which this valve-stem is connected between the ends thereof` a lifterrod connected to the other end of this lifting-lever, a lifting-slide provided with spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, pivotally supported trippers arranged to operate in a manner to disengage the dogs from the lifter-rod to permit the same to drop and the valves to close independently of the engine-operated parts, mechanism to adjust these trippers in a manner whereby their engagement with the dogs may be timed, a lever-handle for each valve set to operate this adjusting mechanism, a link on each leverhandle and an engine-driven governor connected to these links in a manner to control the adjusting' mechanism of the trippers.

6. In a steam-engine, the combination ol' a cylinder, a steam-admitting valve at eaehend, astem on each valve, a lifting-lever supported at one of its ends and to which this valve-stem is connected between the ends thereof, a lifterrod connected to the other end ol this liftinglever, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engineoperated means to raise this slide and rod together, movably-supported trippers adapted to operate in a manner to disengage the dogs from the lifter-rod when moved into the path of said dogs, thereby permitting the rods to drop and the valves to close independently from the engine-operated parts and a governor to control this movement of the trippers. l

7. In a steam-engine, the combination oi a cylinder, a steam-admitting valve at each end, opening mechanism embracing a lifter-rod, a set for each valve, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, trippers supported in a manner to have a reciproeatory movement to and 'from each other and adapted to be moved out of or into the path of' the dogs, acting upon them in the latter ease to disengage the lifter-rods to permit them to drop and the valves to close,'mechanism operating to so move the tripper and operative connection between this mechanism and engine-operated parts whereby the operation oi the trippers is controlled by the piston-stroke.

8. In a steam-engine, the combination of a cylinder, a steam-admitting valve at each end, opening mechanism embracing a lifter-rod, a set for each valve, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, trippers supported in a manner to have a reciproeatory movement to and from each other and adapted to be moved out of or into the path of the dogs, acting upon them in the latter case to disengage the lifter-rods to permit them to drop and the valves to close, mechanism operating to so move the trippers, operative connection whereby this movement'. of the trippers is derived from engine-operated parts and means to adjust and time this movement with reference to the piston-stroke.

9. In a steam-engine, the combination oi a cylinder, a steam-admitting valve at each end, opening' mechanism embracing a lifter-rod, a set for each valve, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, trippers supported in a manner to have a reciprocatory movement to and from each other and adapted to he moved out of or into the path of the dogs,

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acting upon them in thelatter case to disenand the valves to close, mechanism operating to so move the trippers, operative connection whereby this movement of the trippers is derived from piston-operated parts of the engine and intermediate mechanism whereby this derived motion is also proportionally re- I duced at the same time.

10. In a steam-engine, the combination of a cylinder, a steam-'admitting valve at each end, opening mechanism embracing a lifter-rod, a set for each valve, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, trippers supported in a manner to have a reciprocatory movement to and from each other and adapted to be moved out of or into the path of the dogs, acting upon them in the latter case to disengage the lifter-rods to permit them to drop and the valves to close,lmechanism operating to so move the trippers, operative connection whereby this movement of the trippers is derived from the piston-operated parts of the engine, intermediate mechanism whereby this derived motion is also proportionally reduced at the same time and adjusting means to time this reduced movement so that the trippers approach each other to drop the dogs at a certain time with reference to the position of the piston.

' 11. In a steam-engine, the combination of a` cylinder, a steam-admitting valve at each end, opening mechanism embracinga lifter-rod, a

set for each valve, a lifting-slide carrying spring-actuated dogs adapted to engage the lifter-rod, engine-operated means to raise this slide and rod together, movably-supported trippers adapted to operate in a manner to disengage the dogs from the lifter-rod when moved into the path of said dogs, thereby permitting the rods to drop and the valves to close independently from the engine-operated parts, a slide-rod and intermediate means whereby the trippers of the two valve sets are connected so that they may all be moved together, `a connecting-rod to reciprocate this slide-rod and mechanism whereby this connecting-rod is attached to receive actuation from the crosshead of the engine to a certain, proportionallyreduced extent.

12. In a steam-engine, the combination Aof a slide and rod together, movably-supported trippers adapted to operate in a manner to disengage the dogs from the lifter-rod when moved into the path of said dogs, thereby permitting the rods to drop and the valves to close independently from the engine-operated parts, a slide-rod and intermediate means whereby the trippers of the two valve sets are connected so that they may all be moved together, a

connecting-rod to reciprocate this slide-rod, a pendulum-rod mounted with its lower end on a fiXedly-attached pivot and having this connecting-rod attached to it, a second pendulum-rod pivotally mounted with its lower end on the engine-operated cross-head, a boX trunnioned between two frames and receiving the upper part of this second pendulum-rod and a sliding boX mounted on this latter rod and also connected to the upper end of the pendulum-rod first mentioned, the eifect of these pendulum-rods so arranged and interposed between the tripper-actuating slide-rod and the engine-operated parts being to transmit the motion of these latter parts at a certain proportionally-reduced length.

13. In a steam-engine, the combination of a steam-cylinder, steam-admitting valves at each end thereof, engine-operated means to open and close these valves, intermediate trip mechanism for each valve whereby these valves lmay be caused to close independently of the engine-operated means,asliderod operatively connected to the trip mechanism of each valve, so that both of these mechanismsmay beactuated thereby, a connecting-rod to actuate this slide-rod, a pendulum-rod mounted with its lower end on a iiXedly-attached pivot and having the above-mentioned connecting-rod attached to it, a second pendulum-rod pivotally mounted with its lower end on the engine-operated cross-head, a boX supported so as to be free to swivel on its axial line and receiving the upper part of this second pendulum-rod and a sliding boX mounted on this latter rod and also connected to the upper end of the pendulum-rod first mentioned, the effect of these pendulum-rods so arranged being to transmit the motion of the engine-operated parts to the means for actuating the trip mechanism of the valves at a certain proportionallyreduced ratio. u

In testimony whereof I hereunto set my signature in the presence of two witnesses.

HAMLIN F. FRISBIE.

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